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;;; Guix --- Nix package management from Guile. -*- coding: utf-8 -*-
;;; Copyright (C) 2012 Ludovic Courtès <ludo@gnu.org>
;;;
;;; This file is part of Guix.
;;;
;;; Guix is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; Guix is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with Guix. If not, see <http://www.gnu.org/licenses/>.
(define-module (distro)
#:use-module (guix packages)
#:use-module (ice-9 ftw)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-26)
#:export (find-packages-by-name))
;;; Commentary:
;;;
;;; General utilities for the software distribution---i.e., the modules under
;;; (distro ...).
;;;
;;; Code:
(define _ (cut gettext <> "guix"))
(define %distro-module-directory
;; Absolute path of the (distro ...) module root.
(string-append (dirname (search-path %load-path "distro.scm"))
"/distro"))
(define (package-files)
"Return the list of files that implement distro modules."
(define prefix-len
(string-length (dirname %distro-module-directory)))
(file-system-fold (const #t) ; enter?
(lambda (path stat result) ; leaf
(if (string-suffix? ".scm" path)
(cons (substring path prefix-len) result)
result))
(lambda (path stat result) ; down
result)
(lambda (path stat result) ; up
result)
(const #f) ; skip
(lambda (path stat errno result)
(format (current-error-port)
(_ "warning: cannot access `~a': ~a")
path (strerror errno))
result)
'()
%distro-module-directory
stat))
(define (package-modules)
"Return the list of modules that provide packages for the distribution."
(define not-slash
(char-set-complement (char-set #\/)))
(filter-map (lambda (path)
(let ((name (map string->symbol
(string-tokenize (string-drop-right path 4)
not-slash))))
(false-if-exception (resolve-interface name))))
(package-files)))
(define* (find-packages-by-name name #:optional version)
"Return the list of packages with the given NAME. If VERSION is not #f,
then only return packages whose version is equal to VERSION."
(define right-package?
(if version
(lambda (p)
(and (package? p)
(string=? (package-name p) name)
(string=? (package-version p) version)))
(lambda (p)
(and (package? p)
(string=? (package-name p) name)))))
(append-map (lambda (module)
(filter right-package?
(module-map (lambda (sym var)
(variable-ref var))
module)))
(package-modules)))
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